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direct replacement differential?

1K views 0 replies 1 participant last post by  imboyd 
#1 ·
I have a '99 F-150 4x4. I purchased S918A as replacement for the 829A.
The 918 is 9.75 ring with 3.55 ratio. The 918 is 9.75 ring with 3.55 gear ratio. The inside looks different. I can't tell if it's part of traction control or maybe overdrive.
 
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